CRM 2011: while running workflow Method not found: 'Void Microsoft.Xrm.Sdk.Workflow.Activities.GetEntityProperty.set_RefreshWorkflowConditionParameters(Boolean)'.

Hi,

i get the following error every time i run a workflow.

Method not found: 'Void Microsoft.Xrm.Sdk.Workflow.Activities.GetEntityProperty.set_RefreshWorkflowConditionParameters(Boolean)'.

Plugin Trace:

[Microsoft.Crm.Workflow: Microsoft.Crm.Workflow.Activities.ConditionSequence]
[ConditionStep1]



Error Message:

Unhandled Exception: System.MissingMethodException: Method not found: 'Void Microsoft.Xrm.Sdk.Workflow.Activities.GetEntityProperty.set_RefreshWorkflowConditionParameters(Boolean)'.
   at Microsoft.Crm.Workflow.Services.ConditionActivityService.Execute(NativeActivityContext executionContext, ConditionSequence conditionSequence, Variable`1 executionPointer)
   at System.Activities.NativeActivity.InternalExecute(ActivityInstance instance, ActivityExecutor executor, BookmarkManager bookmarkManager)
   at System.Activities.Runtime.ActivityExecutor.ExecuteActivityWorkItem.ExecuteBody(ActivityExecutor executor, BookmarkManager bookmarkManager, Location resultLocation)

i removed all the steps in order to debug. i came to know the problem lies on using following conditional statement. if don't use it then it all works perfectly.

any help will be hugely appreciated.

regards

im